Antistreak means for duplicators



Feb. 1, 1955 c, WHITE 2,7UU,933

ANTISTREAK MEANS FOR DUPLICATORS Filed April 1, 1953 INVENTOR 7/70/1445C l/H/TE M MW United States Patent ANTISTREAK MEANS FOR DUPLICATORSThomas C. White, Memphis, Tenn.

Application April 1, 1953, Serial No. 346,143

3 Claims. (Cl. 101-422) This invention relates to an anti-streak meansfor duplicators. More particularly it relates to a clamp-on attachmentfor applying ink-repelling fluid to the retainer roller of duplicatingmachines to prevent streaking of the printed copy.

Specifically, the invention relates to a pad carried by an arm pivotedto a friction-type clamp which is engageable on the roller carrying yokeof the duplicator and positioned thereby to engage the retainer rollerfor applying ink-repelling liquid thereto.

Duplicator machines conventionally employ retainer rollers and ejectorrollers beneath which the freshly printed sheets pass to discharge, forinsuring proper handling of the printed sheets. While it is obvious thatthe retainer (or hold-down) rollers and also the ejector rollers wouldoperate more satisfactorily if they could be moved inwardly to engagethe printed sheet approximately midway between its center and its edgeso as to equalize the areas of engagement, in the duplicators of theprior art and on most printing jobs this could not be done since therollers, particularly the retainer rollers, pick up ink from the freshlyprinted sheets and transmit the ink to following surfaces so as tothereby streak or smudge succeeding sheets. Thus it has been necessaryfor the operator to remember and to painstakingly laterally adjust therollers for, each printing job in order that they would engage thesheets on unprinted areas generally along margins, closely adjacent theedge of the printed portions in order that the effectiveness of therollers would be as great as could be obtained under the circumstances,while attempting to avoid roller contact with ink, producing a generallyunsatisfactory but unavoidable compromise at best. Even then itfrequently happens that a sheet would become disalined and transfer inkto the rollers, resulting in streaking or smudging of the succeedingimpressions, and in addition many printing jobs are from edge to edgeleaving no uninked areas for roller contact.

The present invention not only prevents such accidental streaking, butalso permits maintaining the rollers in more effective retaining andejecting positions without the streaking that such positioning wouldheretofore produce, and without requiring time-consuming adjustments.

It is a principal object of this invention to provide a device forapplying ink-repellant liquid to the retainer rollers of a duplicator.

It is another object to provide a device of this type which is ofsimple, inexpensive and easily installable construction.

It is the general object of this invention to increase and to improvethe quantity and quality of duplicator output.

The means by which the foregoing and other objects of this invention areaccomplished and the manner of their accomplishment will readily beunderstood from the following specification upon reference to theaccompanying drawings, in which:

Fig. 1 is an elevational view of the discharge end of a duplicatorembodying the invention.

Fig. 2 is a fragmentary elevational view in section taken on the lineII-II of Fig. 1.

Fig. 3 is a fragmentary elevational view taken on the line III-III ofFig. 2.

Fig. 4 is an elevational view of the yoke-carried rollers and therepellant applicator attached thereto, in section taken on the lineIV-IV of Fig. 3.

Fig. 5 is a perspective view of the anti-streak attachment per se.

Referring now to the drawings in which the various 2,700,933 PatentedFeb. 1, 1955 parts are indicated by numerals, in Figs. 1 and 2, thenumeral 11 generally designates a typical duplicating machine having acabinet-type housing 13. At the upper left of Fig. 1 can be seen the topof the fountain or reservoir 15 for the repellant solution. Belowreservoir 15 is the cover 17 for the ink distributing and applyingrollers 19 showing below the ink pan or trough 21. Fan 21 carries aseries of ink application adjustment knobs 23. Hand wheels 25 are forthe manual rotation of the blanket cylinder, and 27 designates one ofthe operation control arms. Parts 29 are the side panels of theinkingroller casing, and are attached to housing 13 as by screws A trayor basket 33 for receiving the printed sheets 35 is attached to housing13 by screw 36 (Fig. 2). Tray 33 has a pair of upstanding stops 37between which the flexible sheet-depressing metallic strap 39 extends,the strap 39 being held in place by a cross bar 41 (Fig. 1) above tray33 and extending across the path of the ejected printed sheets in the(grounded) brush-like metal-bristled static-eliminator 43, over whichthe paper passes from the ejector mechanism with which the device ofthis invention cooperates.

Numeral 45 designates the pressure cylinder between which and theblanket-carrying cylinder (not shown) the sheet of paper 47 is pressedin transferring thereto the impression made on the blanket from"mastercarrying cylinder (also not shown) in well known manner. Pressurecylinder 45, being power-driven along with the other two cylinders, thuscan be considered to he the first member of the ejecting mechanism.Cooperating with cylinder 45 are a pair of retainer rollers 49 (Figs. 2,3 and 4) adapted to bear lightly against the sheet 47 to hold or retamit against cylinder 45 for the proper ejection. Two pairs of pointedstrippers 51 remove the paper sheet 47 from cylinder 45 and guide itbetween the lower ejector roll 53 and the upper e ector rollers 55, fromand by which the sheet is guided over static eliminator 43 and into thetray or basket 33, as previously described.

The retainer or hold-down rollers 49 and the upper e ector rollers aremounted in a yoke 56 formed of two parallel flat metallic bars 57,connected medially by a spacer 59. Yokes 56 are pivotally mounted on ashaft 61, which also serves as the shaft for rollers 49, and which isparallel to the axis of rotation of pressure cylinder 47. Yokes 56 andthe rollers 49 and 55 carried thereby are laterally slidably adjustablealong shaft 61 so as to place said rollers in positions for bestperformance.

It is to avoid streaking or smudging of the printed sheets, either whenthe rollers accidentally contact inked portions or the sheet, or aredeliberately located above such portions for better ejection or to avoidtime-consuming ad ustments, that the present invention was conceived anddeveloped.

The device for applying ink-repellents comprises a clamp 63 convenientlyformed of sheet metal bent into a generally inverted U-shape. The legs65 of the U are preferably vertically slit to form fingers 65A that canbe alternately bent, as shown, for frictional downward engagement overthe opposite surfaces of the spaced side members 57 of the yokes 56. Thetop portion 67 of the U-shaped clamp 63 is preferably provided with tabs65B which may be upstruck therefrom to form bearing posts which arebored to form journals for receiving and rotatably supporting pins ortrunnions 67 by which the channel-bar arm 69 is pivotally attached tosaid clamp 63.

Arm 69 carries in the forward end of its downwardly open channel a pad71 of any suitable liquid-absorbent material. Pad 71 is preferablyconstantly supplied with an ink-repelling liquid by a flexible conduit73 connected at one end to the pad by a connecting tube 75 set in anaperture in arm 69, and at its other end to a reservoir 77 (Fig. 2)attached in any desired and suitable manner to the duplicating machine,or if desired to a reservoir supplying repellant to another part of theapparatus.

In the use of the device, clamp 63 is positioned so that the finger 65Aof legs 65 clampingly engage against the opposite faces of bars 57, thusfirmly but removably mounting the device on yoke 56. Channel-carried pad71 is positioned to rest in contact with the upper portion of theperiphery of hold-down roller 49 and as the roller is revolved, inkrepellant solution is delivered to the periphery of the roller, thustreating same so as to repel any ink from attraction to the roller andthus effectively prevent the streaking and smudging heretofore causedthereby.

Thus it will be seen that I have provided a simple, economical, easilyattachable, yet highly effective and practical device for preventingwork spoilage and/or time-consuming roller adjustments in a duplicatingmachine.

I claim:

1. For use with a duplicating machine having ejecting rolls and at leastone pair of longitudinally alined rollers cooperating therewith to pressprinted sheets against said rolls for ejection thereby, said rollersbeing mounted between a pair of bars forming a yoke-like supporttherefor; a clamp member adapted to engage at least one of said bars, atleast one arm attached to said clamp, a liquid applicator carried bysaid arm, said arm being adapted to hold said applicator inliquidtransfer relationship to one of said rollers, whereby the same canroll over printed impressions without streaking or smudging the samewhen ink-repelling liquid is added to said applicator, said clamp beingformed of a wide strip of sheet metal, bent to form an inverted U-shapedclamp, the sides of said clamp being slit to form fingers, said fingersbeing laterally ofiset so as to embrace opposite sides of said yokeforming bars to frictionally affix said clamp to said bars.

2. An attachment for applying ink-repelling liquid to the retainerrollers of a duplicating machine, comprising a wide metallic strap bentinto inverted U-shape, the legs of which are adapted for clampingengagement with spaced parallel bars of the type used to supportretainer rollers in a duplicating machine, the bight portion of saidU-shaped strap having tabs upstruck therefrom to form facing bearingplates, a horizontally disposed arm between said plates, pins on saidarm adapted to be journalled in alined apertures in said plates, wherebysaid arm is pivotally supported on said clamp for rotation about ahorizontal axis, and an applicator pad attached to said arm adjacent itsfree end.

3. An attachment according to claim 2, the legs of said clamp being slitto form vertically disposed fingers, said fingers being bent to embraceopposite sides of said bars for frictionally attaching said clampthereto.

References Cited in the file of this patent UNITED STATES PATENTS423,660 Brooks Mar. 18, 1890 438,342 Brooks Oct. 14, 1890 2,465,160Levenhagen et al. Mar. 22, 1949 2,647,462 Dell Aug. 4, 1953

